1. Section 3.1: Metabolism and Energy

2. What is a “Metabolism?”
-The term “metabolism” is how well our bodies are able to undergo chemical transformations in order for us to sustain life
-The set of chemical reactions in living organisms

3. What is a “Metabolism?”
-human life is maintained by the 4 main macromolecules: proteins, lipids, carbs, and nucleic acids (DNA and RNA)

4. 2 Forms of Metabolism:
Anabolism
And
Catabolism

5. Anabolism
-Anabolism is the form of using energy to construct cell components ex. amino acids.

6. Catabolism:
-Catabolism is the form of breaking down large molecules ex. The transformation of nutrients in our bodies.

7. What Does it Mean to “Burn” Calories?
-Calories are forms of energy we consume
We convert Chemical Energy into: Kinetic Energy, Heat Energy, Electrical Energy, Sound Energy
Ex. Human Body Temp (37°)

8. Chemical Reactions
-In our bodies the energy is changed through a chemical reaction
-Bonds between atoms are broken and changed so that the energy can be absorbed or released
-We are able to burn/use energy from foods through a Exergonic reaction or an Endergonic reaction

9. Bond Energy -Energy is required to break bonds
-The bond energy is the minimum required energy to break bonds

10. Activation Energy (Ea)
-Energy is required for this reaction called activation energy

11. The 2 types of reactions when this occurs are called exothermic reactions and endothermic reactions.
Exergonic Reaction-A chemical reaction where energy is released from the body
Endergonic Reaction-A chemical reaction where the energy is absorbed from the body

12. How to Calculate Energy in a Reaction
Ex. The Combustion of Methane:

13. Combustion Reaction
A combustion reaction is when all substances in a compound are combined with oxygen, which then produces carbon dioxide and water.

14. *Refer to Pg.129 in textbook*